Nearly all Russian rock acts (Akvarium, Voskresenye, Mashina Vremeni) in the 70s and early 80s performed in very small venues, such as a friend's house, so they were forced to play unplugged so that the neighbours wouldn't hear and turn them in. Rock was severely frowned upon by the authorities. As a result, much of their early rock has a very acoustic feel, but it's still rockish.